Ultrahigh Energy Storage Capacitors Based on Freestanding Single‐Crystalline Antiferroelectric Membrane/PVDF Composites

Abstract

Inorganic/organic dielectric composites are very attractive for high energy density electrostatic capacitors. Usually, linear dielectric and ferroelectric materials are chosen as inorganic fillers to improve energy storage performance. Antiferroelectric (AFE) materials, especially single‐crystalline AFE oxides, have relatively high efficiency and higher density than linear dielectrics or ferroelectrics. However, adding single‐crystalline AFE oxides into polymers to construct composite with improved energy storage performance remains elusive. In this study, high‐quality freestanding single‐crystalline PbZrO3 membranes are obtained by a water‐soluble sacrificial layer method. They exhibit classic AFE behavior and then 2D–2D type PbZrO3/PVDF composites with the different film thicknesses of PbZrO3 (0.1‐0.4 µm) is constructed. Their dielectric properties and polarization response improve significantly as compared to pure PVDF and are optimized in the PbZrO3(0.3 µm)/PVDF composite. Consequently, a record‐high energy density of 43.3 J cm−3 is achieved at a large breakdown strength of 750 MV m−1. Phase‐field simulation indicates that inserting PbZrO3 membranes effectively reduces the breakdown path. Single‐crystalline AFE oxide membranes will be useful fillers for composite‐based high‐power capacitors.

Memory effect in ferroelectric polyvinylidene fluoride (PVDF) films via spin crossover probes

“…29 In particular, the organic ferroelectric polymers have shown promising performances in electrochemistry, 30,31 as dielectric matrices, 32–34 in dye-sensitized solar cells 35–37 and in energy storage. 38–41 One of the most studied ferroelectrics is the β-phase of polyvinylidene fluoride (PVDF) that has TTT (all trans )-oriented polymer chains. It exhibits piezoelectric and ferroelectric properties.…”

Oppositely Charged Interfacial Janus Nanoparticles Induce the Formation of Highly Ferroelectric Poling-Free PVDF Films for Piezoelectric Energy Generation

“…As a ferroelectric material with excellent flexibility, stability, mechanical properties, and processability, poly­(vinylidene fluoride) (PVDF) has been extensively researched for applications in information conservation, − energy storage, , and piezoelectric sensors. − However, obtaining a highly polar ferroelectric β-phase under usual conditions is difficult due to the repulsion between neighboring F atoms . Therefore, enhancing the ferroelectricity of PVDF films is crucial to improve their applicability.…”

Ultrahigh energy storage capacity in multilayer-structured cellulose-based dielectric capacitors caused by interfacial polarization-coupled Schottky barrier height

“…Due to the blocking effect of the PbZrO 3 layer on the spread of electric current, an ESD of 43.3 J cm −3 was achieved. 13 Though the ESD of PVDF-based composites increases rapidly at room temperature, such good properties are difficult to maintain at higher temperatures over 90 °C due to the inferior thermal stability of the PVDF molecular chain. To prepare flexible dielectric capacitors for high-temperature applications, researchers have turned to polyimide (PI)-based dielectric materials.…”